<template>
    <!-- 底部 -->
    <div class="my-footer">
      <!-- 全选 -->
      <div class="custom-control custom-checkbox">
        <input type="checkbox" class="custom-control-input" id="footerCheck" v-model="isShow">
        <label class="custom-control-label" for="footerCheck">全选</label>
      </div>
      <!-- 合计 -->
      <div>
        <span>合计:</span>
        <span class="price">¥ {{sum}}</span>
      </div>
      <!-- 按钮 -->
      <button type="button" class="footer-btn btn btn-primary">结算 ( {{count}} )</button>
    </div>
  </template>
  
  <script>
  export default {
     props:['list'],
     computed:{
        isShow:{
            set(val){
                this.list.forEach(item=>item.goods_state=val)
            },
            get(){
                return this.list.every(item=>item.goods_state)
            }
        },
        sum(){
            return this.list.reduce((prev,item)=>{
              if(item.goods_state){
               return prev+item.goods_count*item.goods_price
              }else {
                return prev
              }
            },0)
        },
        count(){
            return this.list.reduce((prev,item)=>{
              if(item.goods_state){
               return prev+item.goods_count
              }else {
                return prev
              }
            },0)  
        }
     }
  }
  </script>
  
  <style lang="less" scoped>
  .my-footer {
    position: fixed;
    z-index: 2;
    bottom: 0;
    width: 100%;
    height: 50px;
    border-top: 1px solid #ccc;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
    background: #fff;
  
    .price {
      color: red;
      font-weight: bold;
      font-size: 15px;
    }
    .footer-btn {
      min-width: 80px;
      height: 30px;
      line-height: 30px;
      border-radius: 25px;
      padding: 0;
    }
  }
  </style>